analyze/loudness

The loudness analysis task estimates the perceived loudness of an audio file according to the EBU recommendation R128.
Knowing the loudness of an audio file allows you to adjust one file's overall volume to either a reference level or to the loudness of another file, thus avoiding jumps in the perceived playback level in music players. In most cases, adjusting the LU is trivial: add a gain to your audio file that corresponds to the difference between the extracted and the target LU value. You can also verify the EBU standard compliance of your mixes and productions for your customer or broadcasting station.

Allows you to add any strings you might find helpful for later analysis of the request logs.

Response

blocking=false

The response gives you a status code, the file_id and the corresponding download URL of the resulting file (audio for process tasks and xml for analyze tasks). For processing reports, use the /file/status request with the parameter format=xml/json/jsonp/xmlp.

Name

Description

status

The status code of the task.

file_id

The unique identifier of the file.

href

The direct download link to the file including the file_id

blocking=true

The result provides various measures of loudness and level in the audio file.

The pseudo-unit LU stands for loudness unit. In order to increase or decrease the loudness by one LU, apply a gain of +1 (or -1, respectively) dB to the audio. For your mix to be EBU R128 compliant adjust the loudness to 0 LU (0 LU = -23 LUFS). LU values above 0 LU are possible.